Emile paccatjd and fre de



Pamented Aug. 6

PAGCAUD 81: 1P. DE'CQPPET.

LIQUID METER (NoModeI.)

'UNITED STATES i PATENT OFFICE.

EMILE PACCAUD AND FREDERIC DE coPPET, oF LAUSANNE, SWITZERLAND.

LIQUID- METER.

SPECIFIGATION forming part of Letters Patent No. 544,113, dated August 6, 1895.

Application led April 3, 1895. Serial No. 544,282. (No modei.) Patented in Switzerland October l0, 1894J No. 9,150.

To all whom, if; may concern.-

Be it known that we, EMILE PAcoAUD and FREDERIC DE OOPPET, citizens of the Republicl of Switzerland, residing at Lausanne, in said Republic of Switzerland, have invented certain new and useful Improvements in Liquid-Meters, (for which we have received Let.A ters Patent in Switzerland, No. 9,150, dated October l0, 1894,) of which the following is a specification.

The invention relates to an improved liquidmeter containingadifferential piston disposed ina suitable cylinder and being at a` time acted upon and traversed by the liquid to be measured.

The invention consists in certain parts and combination of parts, which will be hereinafter described with reference to the accompanying drawings, which form a part of this speciiication, and in which similar letters of reference indicate corresponding parts in all the figures. Y

vIn the drawings, Figure 1 is an axial section of a liquid-meter of our improved construction. Fig. 2 shows two differenty forms of the rack. Fig. 3 is a 'cross-section on the line a: y of Fig. l, showing the mechanism which is to be found in the upper part of the apparatus. In thisffigure the forked piece which connects thespring to the cranks is moved into its horizontal position in view of better showing the said connection. Fig. 4 shows the slide-valve in a different position than it isshown in Fig. l. Fig. 5 is a cross-y section on linerm ln, of Fig 4, and Fig. 6 is a modified form of gearing.

The box or cylinder is composed of two superposed cylindricalv portions A and A', the diameter of which may diifer more or less; but we prefer to have the diameter of the cylinder A made twice the diameter of the cyl-I inder A.

In the cylinder A A is arranged'a piston B B', which may be made of one piece of metal or any suitable material whatever, and which may be all of one piece or formed of two pieces screwed or otherwise connected to one another, the piston-head B fitting in the cylinder A andthe piston-head B tting in the cylinder A', as shown in Fig. 1. The piston-heads B and B are connected with one heads B and B', as shown in Fig. l.

another by means of a tubular connection B2,

' projecting beneath the lower surface of the piston-head B and having its lower portion K provided with a bottom wall K and with lateral openings'b2 b2. The said tubular connection is, moreover, provided with lateral openings b b', situated between the piston- In the said' tubular connection of the piston-heads B and B is arranged a tubular slide or slidevalve C, which is intended to alternately close or open the openings b and b2, according as the said slide-valve is axially slid in the tubular connection of the pistonheads B and B', or according as said tubular connection slides along the said slide-valve C. The stroke of the said slide-valve C in the tubular connection B2 of the piston-heads B and B is limited on the one hand by the bottom wall of the latter and on the other hand bythe lower end of a iianged sleeve C', engaged in and fixed to the upper part of the said tubular connection.

The slide-valve C is fixed to a rack D, the upper part of which is provided with rackteeth which may either project on two sides of a rectangular portion D of the rod D, as

shown in Fig. 1 and in the left portion of Fig. 2, or which may be made to project circularly around a cylindrical portion of said rack D, as shown in the right portion of Fig. 2, or inany other suitable manner. whatever.

In the box M, which covers the cylinder A, we provide a bracket S, to the lower end of which are j ournaled two gear-Wheels E, each of which engages the rack-teeth of the rack D on opposite sides of the latter, as shown in Fig. 1. The axis of each of the gear-,wheels E bears a pair of cranks e e', connected by means of forked levers F', Fig. 3, to spiral springs F, fixed at f to the upper end of the bracket S.

The cylinder A is provided at its lower end with an inlet-opening X, through which the liquid to be measured -is introduced into the apparatus, and the cylinder A is provided at its lower end with anoutlet-opening Y,

through which escapes the liquid that has been measured.

IOO

Fig. 6 shows a modified construction of the gears intended to transmit to the cranks e e the up and down motions of the-rack D.- Instead of having the cranks e e directly fixed upon the axes of the wheels E, the said cranks are fixed upon the axis of a pinion e2, meshing with wheel E.

rlhe working of the described apparatus is as follows: It the parts are in their respective positions as shown in Fig. l, and if a liquid under pressure is introduced into the apparatus through the inlet X, the said liquid will first fill the cylinder A' up to the piston-head B', and then pass through the openings b2 into the tubular connection B2 of the piston-heads B B and from there into the cylinder A and box M, over the piston-head B. The said piston-head B being of larger diameter than the piston-head B', the pressure of the liquid will operate more efficiently upon the said pistonhead B than on the piston-head B and the double piston will be pressed down in the direction of the arrow 1 of Fig. 1. On this downstroke of the double piston B B the lower end of the sleeve C will strike the slide-valve C and draw the saine down in the direction of the arrow 1. The rack D being lixed to the slide-valve C, it is also drawn down in the same direction and this causes the gear-wheels E to be rotated in opposite directions, as shown by the arrows 2, and as this rotation is imparted to the cranks e the result of the down motion of the rack D will be to distend the springs F.

The described parts are constructed and combined so that the cranks e e arrive at the lower dead-point-that is to say, in their lowest position in which their pins are in line both with the axes of the cranks ee and with the points f, where the springs F are suspended-somewhat before the double piston B B reaches the end of its downstroke. Now, as soon as the cranks e e pass the said lower deadpoint, the springs F,which have been extended as described, cause the cranks to be suddenly rotated to their upper dead-point, and thereby cause the gear-wheels E to suddenly throw the slide-valve C downward and to close the openings b2 of the tubular connection of the piston-heads B B', opening at same time the openings bof the same. The just-described down motion of the piston-head B causes to flow back a larger volume of liquid than the volume which is liable to be aspired by the smaller piston-head B during the same stroke, and the difference between those two volumes escapes through the outlet Y. When the double piston arrives at the end of its downstroke, as described, the openings b2 are closed and the liquid under pressure acts upon the piston-head B only, and causes the same to be raised, and the bottom K of the tubular portion K raises the slide-valve C with it in its raising motion. The rack D causes thereby the gear-wheels E to be rotated in the inverse direction to the arrows 2, and the springs F are again distended by the cranks e e until the pins of the latter reach their lower deadpoint. Then the same effect vis produced as above described, but in inversedirecton, and the slide-valve C is suddenly raised, so as to again open the openings b2 and close the openings b. The length of the slide-valve C is equal to the distance between the lower edges of the openings b and the upper edges of the openings b2, Fig. 4f, and therefore, during a short space of time, which depends on the rapidity of the action of the springs F, the liquid is free to pass through all the openings b', b2, and Y, and the pistonB B therefore stops a moment. This avoids the ram-stroke which would otherwise occur, and it is very easy to exactly record the volume of the liquid passing through the apparatus byeach stroke, inclusive of the small volume passing through the same, while the double piston is stopped. After this very short stopping of both the double piston and the slide-valve C, the double piston is alone raised to the top, as above described.

We may provide any recording device whatever, so that the volume of liquid passing through the apparatus may be exactly recorded on a dial or scale of any kind. The said recording device may be moved or acted upon in a suitable manner by the wheels E or by the rack D, or by any other movable part of the apparatus whatever. AThe said recording device may either be placed in the box M or externally of the same. In the rst case part of the walls of the said box M must be made of glass, and in the second case the said box M must be provided with a suitable stu'ng-box, so that one of the moving parts of the described apparatus may be connected withy the said recording device.

Having thus fully described our invention, we claim- 1. In au improved liquid meter the combination of two superposed cylinders of different diameters, the smaller one having an inlet-opening and the larger one an outlet-opening for the liquid which is to be measured, a double-piston having two heads o1' sizes corresponding to the interior diameter of the respective cylinders, each head of which is adapted to play in the proper cylinders, a tubular-connection between said two heads of the double-piston, the said tubular-connection having openings connecting the interior of the same with the space between the two piston-heads and openings connecting the interior with the space beneath the smaller piston, a slide-valve adapted to play in the said tubular-connection so as to alternately close and open the respective openings, and a rack connected to the said slide-valve and acting upon by means of any suitable gearing one or more cranks connected to one or more springs which tend to raise the slidevalve and which are extended by the downmotion of the said slide-valve, substantially IOC IIO

as shown and described and for the purpose specified.

2. Inv liquid meters, a double pistonB B names to this specification in the presence of having openings b b2 and a sleeve C", in com# two subscribing witnesses. bination with a, s1ide-va1ve C a. rack D conneeted with the slide-valve, gearing adapted 5 to act upon the rack andv cranks e e connected to springs F, substantially as shown Witnesses: and described and for the purpose specified. ELMER SCHNEIDER, In testimony whereof We have signed our BENJ. H. RIDGELY. 

